Be or BE may stand for:
- Be: a letter of Cyrillic alphabet
- be: The infinitive form of the copula in the English language
- Be, Incorporated: a software company offering the BeOS operating system for personal computers. The company sold its assets to Palm, Inc in 2001
- Belgium: ISO country code
- Berne: canton of Switzerland
- beryllium (Be): chemical symbol for the chemical element with atomic number 4 in the periodic table.